Random intercept and slope model

"How does relative humidity influence the abundance of orchids?"

Since you are more interested in answering a question about the wider population of sites rather than the particular sites you have sampled, you will, once again, move from a GLM to a Mixed Effect Model. This time, you'll use a random intercept and slope model to examine how site effects the distributions of both the intercept and slope coefficients.

Recall that a random intercept and slope model can be applied using:

lme(y ~ x, random = ~1 + slopeVariable|randomEffect, data = myData)

Note that the orchids data set and nlme library have been preloaded.

Look at the research question and apply a random intercept and slope model to evaluate how site effects the intercept and slope of the model.
Look at the output of the model.

Exercise

Random intercept and slope model

Instructions